Erastic Corporation has $20,000 in cash, $11,000 in marketable securities, $43,000 in account receivable, $52,000 in inventories, and $48,000 in current liabilities. The corporation's current assets consist of cash, marketable securities, accounts receivable, and inventory. The corporation's acid-test ratio is closest to: 1.31 2.63 1.54 0.90